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If x=2cost-cos2t ,y=2sint-sin2t ,"f i n...

If `x=2cost-cos2t ,y=2sint-sin2t ,"f i n d"(d^2y)/(dx^2)"a t"t=pi/2dot`

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`dy/dx=(dy/dt)/(dx/dt)=(2cost-cos2t*2)/(-2sint+sin2t*2)`
`=(cos2t-cost)/(sint-sin2t)`
`(d^2y)/(dx^2)=((-sin2t^2+sint)(sint-sinn2t)-(cos2t-cost)(cost-2cos2t))/((sint-sin2t)^2-2(sint-sin2t))`
`=((1*1-(-1)*2)/(-2(1)))`
`=-3/2`.
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